real interest rate
Real Interest Rate is the interest you actually earn or pay after inflation has taken its bite, showing whether your money truly grew or just looked bigger.
In plain English
Your uncle calls from Lagos, excited. He put ₦500,000 in a fixed deposit last year at 15 percent, and now he has ₦575,000. He wants you to be impressed, and you should be, a little. But then you both remember that garri, fuel and school fees all cost more this year than last year, and suddenly that extra ₦75,000 does not stretch as far as it should.
That gap between the interest rate you see on paper and what your money can actually buy afterwards is the real interest rate. The bank advertised 15 percent, that is the nominal rate, the number printed on the slip. But if inflation ran at 20 percent that year, your money did not grow in real terms, it shrank. You have more naira, but less power.
The simple way to think about it, real interest rate is roughly the nominal rate minus inflation. So 15 percent interest minus 20 percent inflation gives you a real rate of about negative 5 percent. Your uncle's ₦575,000 buys less than his original ₦500,000 could have bought a year ago.
This is why Nigerians who save in naira sometimes feel like they are losing even when the account balance is climbing. It also explains why some people in the diaspora, sending money home to Enugu or Kaduna, prefer to convert into dollars or invest abroad first, because a bank in the United Kingdom offering 4 percent when inflation is 2 percent gives a real return of 2 percent, small but positive, while a Nigerian account might offer double the rate and still lose ground.
Real interest rate is not about the number the bank shouts about. It is about what survives after prices have had their say.
₦1,000,000 in a savings account earning 12 percent nominal interest becomes ₦1,120,000 after a year. If inflation that year was 18 percent, the real interest rate is about negative 6 percent, meaning the money's actual buying power fell even though the account balance grew.
Questions people ask
Why does my savings account balance grow but I still feel poorer?
Because the interest rate on your account is nominal, the raw number the bank quotes. If inflation is higher than that rate, your naira balance rises but its buying power falls. That gap is the real interest rate, and in Nigeria it has often been negative, meaning savers lose value even while their account statement looks encouraging.
How do I calculate the real interest rate myself?
Take the nominal interest rate your bank or investment offers and subtract the current inflation rate. If your fixed deposit pays 14 percent and inflation is 22 percent, your real interest rate is roughly negative 8 percent. It is a quick estimate, not exact to the decimal, but it tells you honestly whether you are gaining or losing ground.
Can the real interest rate ever be higher than the nominal rate?
Yes, this happens when inflation is very low or even negative, called deflation. If a United Kingdom savings account pays 3 percent nominal interest and inflation is only 1 percent, the real interest rate is about 2 percent, meaning your money's buying power actually improved, which is a comfortable and fairly rare position to be in.
Last reviewed